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September 12, 2011

Fujitsu Launches CMOS DAC for Optical Transport Systems

Provides data links of 100Gbps and higher over a single lambda

By CBR Staff Writer

Fujitsu Semiconductor Europe (FSEU) has introduced its first- generation 8-bit, 4-channel DAC in 40nm CMOS technology with a sampling rate range of 55 – 65 GSa/s per channel, small footprint and low power (0.75W/channel).

This technology provides data links of 100Gbps and higher over a single lambda to the long-haul optical transport systems.

The new DAC compliments the 40nm 55 – 65 GSa/s Fujitsu CHAIS ADC for 100Gbps coherent receivers and also offers fast sampling rates, high resolution, low noise and wide bandwidth signal generation for OTU4 signals complimenting the 40nm 55 – 65 GSa/s Fujitsu CHAIS ADC for 100Gbps coherent receivers,the company said.

The high-performance converters allow for their integration on a single die together with a complex DSP and high-speed serial OTN framer interfaces to form a 100Gbps DP-QPSK transceiver.

For a device with 4 ADC and 4 DAC channels running at 65GSa/s, the data (2 Tbps) will be converted to and from the analog to the digital domain provides a single die solution.

Managing variations in the four signal components lanes in digital domain allows precision control which is stable across processing, temperature or voltage variations in the transceiver device.

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The requirement of a separate multiplexer/encoder device can be avoided by integrating the 4-channel DAC into a transceiver device.

FSEU,Director of the communications business unit Manfred Mettendorff said that they are proud of the achievements Fujitsu has made so far in bringing a portfolio of leading-edge CMOS offerings to the market to allow widespread, real-world deployment of single wavelength 100Gbps systems.

"The new technology not only underpins refinements in the current generation of 100Gbps systems, such as broader feature sets and power optimisations for smaller form factors, but will also enable 400Gbps transport rates and beyond," said mattendroff.

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